盐化物融雪沥青混合料性能评价.pdf

Evaluate on the performance of snow melt salt asphalt mixtureA Dissertation Submitted for the Degree of MasterCandidate:Bai YanjunSupervisor:Prof. Chen ShuanfaChang’an University, Xi’an, ChinaI摘要冬季路面积雪结冰给行车安全带来隐患,为保障冻结道路畅通和行车安全,避免或减少交通事故,提高道路通行能力与运营效率,必须采取有效措施清除路面冰雪。常见的机械、人工除雪工程量大,作业效率低,而撒布融雪盐除雪,对环境和生态造成严重危害,本文提出铺筑盐化物融雪沥青路面,以实现路面的自融雪功能。论文通过对比密度容积代换法、等容积替换法、合成级配法三种盐化物沥青混合料设计方法,推荐采用密度容积代换法进行盐化物沥青混合料的设计。对比不同盐化物(IceBane和MFL)及其掺量下混合料的路用性能发现:随着盐化物掺量的增大,盐化物沥青混合料的高温稳定性、低温抗裂性、水稳定性等常规路用性能有所下降,但下降幅度较小,尤其是IceBane沥青混合料;相同掺量下,IceBane沥青混合料水稳定性优于MFL沥青混合料。基于稀溶液蒸气压下降理论,分析了盐化物融雪沥青路面的融雪机理,以电导率为评价指标分析路表盐化物有效成分溶析规律,变化空隙率、掺量、浸泡时间、温度、荷载条件及浸泡方式,分析各因素对融雪路面融雪性能的影响,得出掺量、空隙率是主要影响因素。采用自然融雪试验、抑制冻结试验和加速融雪试验评价盐化物沥青混合料的融雪性能,结果表明Icebane融雪沥青混合料具有良好的融雪效果,自行设计模拟降水对道路表面的冲刷,验证盐化物融雪沥青路面融雪性能在五年内的时效性。通过试验路铺筑,总结提出了盐化物融雪沥青路面的施工工艺及质量控制方法。关键词:盐化物,沥青混合料,路用性能,融雪性能IIAbstractIn the winter, snow cover and ice will bring hidden troubles with safety and efficiency. In order toensure the free driving and traffic safety , to avoid, or to some extent, reduce traffic accidents, and to improve traffic capacity and operation efficiency ,Measures must be taken to remove ice and snow on the road. Common mechanical and artificial snow removal has large engineering quantities , low operating efficiency, while bestrewing melting snow salt causes serious prejudice to the environment and ecology. Therefore, the paper proposed to pave salt snowmelt asphalt pavement, in order to realize the function of the road surface melting contrasting the three methods of asphalt mixture: substitution of volume density design--density method, substitution method ,and method of synthetic gradation , this paper finally mends substitution of volume density design--density method to design salt asphalt mixture in different contents .Through an analysis of the road performance with the different salt (IceBane and MFL), the different proportion salt asphalt mixture, it is shown that : with the increase